PC switches back on on its own after shut down!

I just bought a HiGrade PV4 2400 desktop and after it completely shuts down, it switches back on on its own, 10/15 min later. The technician who came to see it changed some settings in BIOS but the problem persists (i.e unless I actually switch the plug off, it will switch back on).Do you think I should just accept the company fixing it or could it be a serious fault and I should demand a replacement?

when your computer shuts down then starts againyou could force a shutdown by keeping the power button pressed for about three seconds(or untill it turns off)you may be greeted by scandisk when you start agan, let it scan

My Pc running WinME is on a network. If the other computers have not been switched on, the PC can be switched off normally.However, if one of the other computers has been used (and there has been some transfer of info between them), then the PC restarts when shut down.I have to shut down a second time before everything is ok.This is not the same fault as yours, but illustrates some programming fault.